test(macos): try fix for macpack asyncio crash on Python 3.14

[Justme0606]

macOS CI was failing with RuntimeError: There is no current event loop in thread 'MainThread'. Python 3.14 no longer automatically creates an asyncio event loop when calling asyncio.get_event_loop().
Solution:
Improved the macpack patching process to replace asyncio.get_event_loop() with Python 3.14-compatible code:

pythontry:
    loop = asyncio.get_running_loop()
except RuntimeError:
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)

Also fixed the patch script to use python3 instead of python.

[MSoegtropIMC]

Please add a description in the PR for what the root cause is and how the patch fixes it - otherwise it is hard to review.